fix #2587: Resolve VAD multithreading issue (#2613)

majic31

2025-08-14 5115a066c971b2380c98f9be168e14869053eda1

 runtime/http/bin/funasr-http-main.cpp

@@ -510,6 +510,7 @@

    s.run();
    LOG(INFO) << "http model loop " << s_port;
    conn_guard.reset();
    // wait for theads
    for (auto &t : decoder_threads) {
      t.join();